P0456-001
08-27-2015, 06:15 AM
#1
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P0456-001
CEL came up on my 2007 Audi Q7 and it says I have a very small leak detected. Was told it was my N80 valve which I replaced and had code cleared. Code came back again, any ideas what else it could be? Vacuum leak? Let me know if anyone has any ideas, thanks guys!!
08-27-2015, 12:30 PM
#2
AudiWorld Member
need to check Evaporative Emission (EVAP) System lines for a small crack. leaking/faulty
This is hard, but maybe you will get lucky. Now to check the system a smoker machine will find this leak. Fill the lines with smoke and look at the whole system for the leak.
also it will take sometimes 3 or 4 days for the computer to clear the code, needs to run its cycle.
This is hard, but maybe you will get lucky. Now to check the system a smoker machine will find this leak. Fill the lines with smoke and look at the whole system for the leak.
also it will take sometimes 3 or 4 days for the computer to clear the code, needs to run its cycle.
08-27-2015, 05:36 PM
#3
Could also just be the fuel filler cap. I had to replace the cap on my 3.6 to cure an EVAP related CEL (don't remember the OBD P-code). The 4.2 hasn't had the issue (yet) but the seal on the fill cap is getting hard and cracked like the 3.6's was when it was throwing the CEL.
